CN2770927Y

CN2770927Y - High-strength polyethylene fiber bullet proof helmet shaping mould

Info

Publication number: CN2770927Y
Application number: CNU2005200337365U
Authority: CN
Inventors: 夏华; 黄虹; 陈元芳; 张鹏; 邓明; 黎勇
Original assignee: Chongqing Institute of Technology
Current assignee: Chongqing Institute of Technology
Priority date: 2005-03-29
Filing date: 2005-03-29
Publication date: 2006-04-12
Anticipated expiration: 2015-03-29

Abstract

A high-strength polyethylene fiber bulletproof helmet shaping mould. A convex module and a concave module are guided by a guide pillar to move up and down relatively; the concave module is installed on a concave module panel through a support ring and combined with the concave module panel to form a sealed cavity; a cooling pipe is installed on the outer wall of the concave module in the sealed cavity equipped with an oil inlet pipe and an oil outlet pipe both connected to an oil pump; the convex module and the convex module seat are combined to form another sealed cavity, and a cooling pipe is installed on the inner wall of the cavity; the middle part of the cavity is equipped with a hot oil dispenser connected with an oil inlet pipe, and the cavity is also equipped with an oil outlet pipe. Adopting the helmet high-strength polyethylene fiber bulletproof helmet shaping mould can effectively overcome the defect of metal helmet and it has the features of light weight and good air permeability, and the bullet can be plunged into the helmet shell instead of being splashed to hurt anybody else.

Description

The high-strength polyethylene fiber bulletproof helmet forming mould

Technical field

The utility model relates to a kind of nonmetal bulletproof helmet forming mould, is specifically related to the high-strength polyethylene fiber bulletproof helmet forming mould, belongs to the mould field of engineering technology.

Background technology

Traditional bulletproof halmet, great majority are to be formed by the metal material manufacturing, and this class helmet can not satisfy the requirement of era development.Its major defect is: the quality of the helmet is big, and the wearing personnel load heavily, and are airtight substantially, because the big bullet of its rigidity splashes to rebound away and may injure other people, causes the secondary injury easily.Main in the world developed country brings into use the nonmetal helmet to replace metal helmet comparatively at large.But the key of nonmetal helmet is the bulletproof effect of self, how to improve the bulletproof ability of the nonmetal helmet, is the problem that those skilled in the art need solve.With regard to present research situation, mainly contain the problem of following two aspects.The one, the research of high performance nonmetallic materials and adhesive; The 2nd, the research of moulding process and mould structure.The proportion of high-tenacity polyethylene fibre is the lightest in all high-performance fibers, and weight has only 1/8 of steel wire; Its intensity wants high 12 times with comparing with the steel wire of diameter, has very high specific strength; It also has low temperature resistant, endurance, wear-resistant, good performances such as uvioresistant and electric insulation simultaneously.Studies show that high-tenacity polyethylene fibre is the preferred material of the helmet, but its difficulty of processing is big, how controlling moulding is the person skilled technical issues that need to address.

The utility model content

Exist quality big at the metal bulletproof halmet, the wearing personnel load heavily, substantially airtight, cause the deficiency of secondary injury, the purpose of this utility model to provide a kind of temperature of regulating easily to solve the bulletproof halmet particular manufacturing craft of high-strength polyethylene fiber moulding difficulty.

The purpose of this utility model realizes like this: the high-strength polyethylene fiber bulletproof helmet forming mould, comprise punch, die, and punch can be moved up and down by the guide pillar guiding relatively with die; Die is located on the concave template by support ring, and is combined to form sealed cavity; The die outer wall evenly is provided with cooling water pipe in the sealed cavity, and this sealed cavity also is provided with oil-feed conduit and the oil out duct that is connected with oil pump; Punch and convex mould base are combined to form another sealed cavity, and cavity inner wall is established cooling water pipe, and the cavity middle part is provided with the deep fat distributor, and the deep fat distributor is communicated with the oil-feed conduit, and this cavity also is provided with oil out duct.

Adopt this mould high-tenacity polyethylene fibre can be made bulletproof halmet as follows:

(1) with the polythene material of sheet through after superimposed, place between protruding, the die;

(2) the primer fluid press makes punch descending at a slow speed, and the polyethylene fibre material that sheet is superimposed is pressed in the mould concave die cavity, and thickness is 8～10mm; Keep-up pressure at 80～100Mpa;

(3) with the interior deep fat that feeds of upper and lower cavity protruding, die, mold temperature is raise when reaching 130 ℃, insulation 25～30Min;

(4) then, start cooling system cooling water pipe feeding cold water protruding, die is cooled off mould and workpiece, be cooled to room temperature and get final product;

(5) last, workpiece is taken out, cut edge and surface treatment.

Adopt the high-strength polyethylene fiber material helmet of the utility model manufacturing, can overcome the shortcoming of metal helmet effectively, it has light weight; Gas permeability is better; Bullet is absorbed in the helmet shell, the characteristics such as injuring other people of can not splashing away.By the die trial debugging, the mould result of use is good, and the product that this mould is produced is in relevant engineering test and test, by The Ministry of Public Security of the People's Republic of China, MOPS's relevant industries standard.

Description of drawings

Fig. 1 is the utility model high-strength polyethylene fiber bulletproof helmet forming mould structure schematic diagram,

Fig. 2 is the heating schematic diagram of punch.

Fig. 3 is a punch recirculating cooling water system schematic diagram.

The specific embodiment

As shown in Figure 1, the high-strength polyethylene fiber bulletproof helmet forming mould, punch 1 can be moved up and down by guide pillar 10 guiding relatively with die 2.Die 2 is located on the concave template 4 by support ring 3, forms sealed cavity between die 2, support ring 3 and the lower bolster 4, and die 2 evenly coils cooling water pipe 5 near the outside wall surface of workpiece 13; This sealed cavity bottom also is provided with the oil-feed conduit 18 that is connected with oil pump, and the top is provided with oil out duct 19, in order to feed and to discharge deep fat.Punch 1 forms another sealed cavity 8 with convex mould base 7, cavity inner wall coiling cooling water pipe 6 near workpiece 13, the cavity middle part is provided with deep fat distributor 9, and the deep fat distributor is not connected with deep fat pond (drawing among the figure) by conduit 15, and the top of sealed cavity 8 also is provided with oil out duct 16.Among the figure, the 11, the 17th, water inlet pipe, the 12nd, O RunddichtringO, the 13rd, workpiece, the 14th, outlet pipe.

Fig. 2 is the heating schematic diagram of punch, deep fat imports the sealed cavity 8 of punch 2 from oil inlet pipe 15, by deep fat distributor 9 deep fat is sprayed to the inner surface of punch oil sump uniformly, evenly heats punch 2, after deep fat and punch 2 heat exchanges, from flowline 16 with deep fat water conservancy diversion oil sump tank.By regulating the deep fat flow of deep fat distributor 9 all directions and different parts, thereby control the temperature at each position of patrix accurately, equably, with the temperature difference of mold be controlled at design temperature ± 5 ℃ of scopes in.

Aspect cooling, adopt the cooling of duct type recirculated water, as shown in Figure 3.Cooling water enters from water inlet pipe 11, carries out heat exchange by circulating line 6 and punch 2, and the heat of punch is taken away, and flows out from outlet pipe 14.For the ease of bending forming, make of copper pipe.Copper pipe adopts the refined lead weldering to be connected with punch, guarantees the air-tightness of pipeline and the validity that heat is transmitted.

Die adopts the intensification that deep fat heats up, cooling water temperature is controlled workpiece similar to punch with cooling, no longer repeats at this.

Following problem will be noted in this mould structure:

1, mould will have good guider.The polythene material of sheet is through after superimposed, along circumferential material in the descending process of punch, material thickening and inhomogeneous, cross component force is big.If there is not good guider, will cause the circumferential thickness inequality of product.

2, need exhaust in the pressure maintaining period.Material is shaped under pressure and temp, has certain gas to overflow, if there is not exhaust process, will influence the quality and the density of product.

3, the air-tightness of cooling system will be got well, and never allows the phenomenon that water oil interpenetrates and takes place, and does not more allow to occur the situation of leaking in oil sump, otherwise will be danger close.

4, the intensity of mould, rigidity Design are very important, because the needs of technology, the working portion part of this mould all has been designed to the structure of hull shape class, and under hundreds of tons pressure, mould can not have distortion, otherwise, will cause product rejection.

5, the pipe joint of mould is a lot, all should be designed to the structure of hydraulic quick coupler, to shorten the non-cutting time of mould in the Installation and Debugging process, enhances productivity.

The punch of this mould and die belong to dark shape chamber complex-curved class hull shape part, and the surfaces externally and internally of part all needs to carry out numerical control formation processing, and the form accuracy of working surface and surface quality require all very high, otherwise will influence the shape of product and the demoulding of goods.The wall thickness of working portion is designed to 30mm, and the bottom has added two annular brace circles, and to guarantee the strength and stiffness of die, the surface roughness Ra of working surface inner chamber requires below 0.8 μ m, and heat treatment hardness is 40～43HRC.---numerical control roughing---heat treatment one numerical control fine finishining---pincers worker combination assembling that its process route is: get the raw materials ready-common process.

The utility model is selected hydraulic press and the above-mentioned mould of 5000KN for use, and through---insulation---the cooling and shaping high-strength polyethylene fiber bulletproof helmet that heats up, concrete steps comprise:

1, with the polythene material of sheet through after superimposed, place between protruding, the die;

2, the primer fluid press makes punch descending at a slow speed, and the polyethylene fibre material that sheet is superimposed is pressed as in the mould concave die cavity, and thickness is that 8mm is advisable; Keep-up pressure at 80～100Mpa:

Be incubated when 3, adopting the oil sump heater that mold temperature is elevated to 130 ℃, middle primer fluid press makes the up at a slow speed exhaust of patrix once; In insulating process, polythene material has local fusion plasticity to flow, and makes the thickness at each position of the helmet more even, organizes finer and close.

4, behind insulation moulding 25 or the 30Min, start cooling system, water pipe is fed cold water and mould and workpiece are cooled off shaped goods.

5, last, product is taken out, cut edge and subsequent handling such as surface treatment.

The surface temperature of mold cavity when forming temperature is meant the moulding helmet, the actual forming temperature of helmet part is the helmet to be heated with the transfer mode that contacts of goods by mould, and under uniform temperature and pressure, produce chemical reaction with its moulding, curing, form helmet product.This forming die structure is compared with the heat pressing and molding mold of traditional nonmetallic materials, and strict to temperature controlling, molding thickness is big, and the profile near vertical is arranged, the transmission difficulty of plastic force.The temperature control system that adopts the heating and cooling of special-purpose temperature control system and mould structure independently to control makes upper and lower mould independently carry out adjustment respectively.Aspect heating, created the oil sump mode of heating.

Used high-tenacity polyethylene fibre of the utility model and adhesive have specialized company to produce, as ningbo of china DaCheng Co., Ltd, and Dutch DSM N. V., U.S. HONEYWELL company etc.The utility model belongs to the plastic material hot extrusion briquetting technique, the main technologic parameters of moulding comprises forming temperature, briquetting pressure and molding time, and the three both connected each other, again mutual restriction, the correctness of these three parameters selections directly influences the quality and the bulletproof ability of the helmet.One of ordinary skill in the art know that all the heat transfer property of polythene material is very poor, for helmet material is heated to predetermined forming temperature, need time enough.The effect of briquetting pressure is that helmet material is pressed into mold cavity, under certain temperature and pressure, makes the material cured reaction, obtains stable shape of product.The length of molding time is relevant with the speed of curing reaction, improves mold temperature, and curing reaction is speeded up, molding time shortens, but forming temperature is too high, can cause the decline of product ballistic performance, and the moulding temperature is low excessively, and then molding cycle is oversize, and production efficiency descends.

Claims

1, high-strength polyethylene fiber bulletproof helmet forming mould comprises punch (1), die (2), and punch (1) can be moved up and down by guide pillar (10) guiding relatively with die (2); It is characterized in that die (2) is located on the concave template (4) by support ring (3), and be combined to form sealed cavity, die (2) outer wall evenly is provided with cooling water pipe (5) in the sealed cavity, and this sealed cavity also is provided with oil-feed conduit (18) and the oil out duct (19) that is connected with oil pump; Punch (1) is combined to form another sealed cavity (8) with convex mould base (7), cavity (8) inwall is established cooling water pipe (6), the cavity middle part is provided with deep fat distributor (9), and deep fat distributor (9) is communicated with oil-feed conduit (15), and cavity (8) also is provided with oil out duct (16).